Such an awesome piece of art! I'm rooting for Nidorino, but Gengar has a bit of an advantage. He's faster, most likely has the ability Levitate, and won't take all that much damage from Nidorino's Poison moves.

The color scheme on Nidrino looks more likably "old school" as well instead of the true eastablished bright pink we know it has .It makes it feel that you can more easily see how it transitions into a Nidoking esp.with the scale u gave it nxt to the Gengar here.